Regensburg 2025 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Organic Electronics and Photovoltaics I

CPP 3.3: Vortrag

Montag, 17. März 2025, 10:00–10:15, H38

Towards printing of organic solar cells out of green solvents — •Peter Müller-Buschbaum — TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany

Despite big achievements in terms of power conversion efficiencies in the last years, with champion efficiencies above the 20% limit, it remains an unresolved challenge to fabricate large-area organic solar cells without sacrificing efficiencies. Large-area deposition of the conjugated polymer donor and small molecule acceptor blends via printing is key in the device upscaling. Another issue calling the attention is the fabrication of environmentally friendly organic solar cells. To become environmental-friendly, the used solvents are a key factor. Today, still the most used solvents are harmful and can cause environmental pollution during the device fabrication process and waste solvent treatment. Accordingly, we investigate the printing of donor-acceptor blend films out of different solvents for use as active layers in organic solar cells with advanced in-situ scattering methods. We use grazing incidence small and wide-angle X-ray scattering (GISAXS and GIWAXS) in-situ during printing to gain a fundamental understanding of the underlying film formation processes. Different examples of polymer donors and small molecule acceptors are presented, and the resulting morphologies are correlated with solar cell device performance. A special emphasis is put on the shift towards more environmentally friendly solvents, which will also be a prerequisite to promote the large-scale production of organic solar cells.

Keywords: organic solar cells; printing; green solvents; in-situ scattering